10 Terms
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Seismology
The study of earthquake, seismic sources, and wave propagation through the Earth.
Industry: Earth science
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Seismology
plate tectonics
Earth science; Seismology
A theory supported by a wide range of evidence that considers the Earth's crust and upper mantle to be composed of several large, thin, relatively rigid plates that move relative to one another. ...
blind thrust
Earth science; Seismology
A deep crustal thrust-fault with no or only indirect surface expression such as a fold structure.
zonal harmonics
Earth science; Seismology
Used to describe Earth's normal modes using Legendre polynomials. The Zonal harmonics represents the lowest order of the polynomial where the number of great circles through the pole with zero ...
group velocity
Earth science; Seismology
Wave disturbances with a wide spectrum of periods interfere with each other producing constructive and destructive patterns. The constructive patters travel along the surface as wave packets with ...
surface waves
Earth science; Seismology
Waves that move over the surface of the Earth. Rayleigh and Love waves are surface waves.
microseism
Earth science; Seismology
A more or less continuous motion in the Earth that is unrelated to an earthquake and that has a period of 1. 0 to 9. 0 seconds. It is caused by a variety of natural and artificial agents.